
void print_string(char * pstr, unsigned char row, unsigned char col, unsigned char color);
void out_hex_byte(unsigned char ch, unsigned char row, unsigned char col, unsigned char color);
void out_hex_word(unsigned short ch, unsigned char row, unsigned char col, unsigned char color);
void out_hex_dword(unsigned int ch, unsigned char row, unsigned char col, unsigned char color);
void clearScreen();